Where to put plain object classes?

Using Composer is the way to go. But you don't have to setup a package with packagist or any of that stuff. Just use if for it's autoloader.

You can make a new folder anywhere you want. Call it "mystuff". Now, create a composer.json file with the following contents:

Code:

{
   "autoload": {
       "psr-4": {
           "MyStuff\\": "mystuff/"
       }
   }
}

Then you can create classes with the MyStuff namespace and have Composer provide the autoloading.

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